Leon Duray "Jigger" Sirois is an American former racing driver from the small town of Shelby in northern Indiana. He raced in a variety of racing genres, most notably midget, stock and Indy "Big" cars. Sirois is the son of former longtime veteran Indy 500 mechanic Earl "Frenchy" Sirois, who worked on the winning cars of Lee Wallard, Sam Hanks, and Jimmy Bryan during his 40 year career. Sirois is named after driver Leon Duray. The nickname "Jigger" is in reference to family friend, two-time Indy-winning riding mechanic Jigger Johnson, as well as a nickname given to him by his older sister.

Shelby is an unincorporated community and census-designated place in Cedar Creek Township, Lake County, Indiana. Shelby had a population of 453 at the 2020 census.